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怎样看镜子是不是银镜

更新时间: 2020-11-02 00:00:00     

银镜是用硝酸银做镀膜,不易氧化,不易生锈。普通镜子可以用硝酸汞或硫酸汞替代硝酸银,以节省成本,但汞的稳定性不如银的不好,易氧化而生锈。用肉眼看,银镜显得特别亮,而普通镜子亮镜略差。近视镜是凸透镜,老花镜是凹透镜,凸透镜有放大作用,凹透镜有缩小作用,而普通镜子是平板玻璃做的没有放大和缩小功能,用把它们对准物品一比照便知分晓。

关键词: 怎样 镜子

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